We look at the division of 545071 by 15 
The aim is to understand the frequency of 15 in 545071.

Advancing to step 1:
When dividing 5 by 15, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Include the next digit (4) from the dividend after 5, then repeat: 54 / 15

Going ahead to step 2:
The number 15 fits into 54 3 times, leaving a remainder of 9.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we subtract 45 from 54, we get 9.
Bring next digit (5) of the dividend behind the 9 and repeat the process: 95 / 15

On to step 3:
When dividing 95 by 15, we get 6 with a remainder of 5.
Use 6 as the next digit of our solution. 
Result so far: 36.0
If we take 90 away from 95, we end up with 5.
Take the next digit (0) from the dividend and append it to 5, then repeat: 50 / 15

Advancing to step 4:
15 goes into 50 3 times with a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 363.0
Deduct 45 from 50 and we're left with 5.
Append the next digit (7) from the dividend to 5 and continue with: 57 / 15

Moving on to step 5:
15 goes into 57 3 times with a remainder of 12.
Record the quotient 3 as the next digit in the result. 
Result so far: 3633.0
If we subtract 45 from 57, we get 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 15

Step 6:
15 goes into 121 8 times with a remainder of 1.
Write down 8 as next digit of the result. 
Result so far: 36338.0
Subtracting 120 from 121 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
15 can be fit into 10 0 times, resulting in a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 36338.0
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
If we divide 100 by 15, we get 6 and a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 36338.06
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 9:
When dividing 100 by 15, we get 6 with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 36338.066
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

After the division, we end up with 36338.066 and a remainder of 0.001.